Postal box unit or similar article



FIG. 1 is a top perspective view of a postal box unit or similar article showing my new design;

FIG. 2 is a bottom perspective view thereof; and

FIG. 3 is an enlarged top perspective view of a modification of my new design, the bottom and sides not shown are similar to those shown herein. 

The ornamental design for a postal box unit or similar article, as shown and described. 